The Architectural Record recognized R-Guard FastFlash and Cat 5 air/water barrier in the category of "Top Waterpoofing Products of 2010".
FastFlash is part of the family of PROSOCO R-GUARD® products developed to prevent the unwanted movement of water and air through building envelopes. Utilize FastFlash as a liquid flashing membrane in rough openings and to counterflash waterproofing and air barrier components in new or existing wall assemblies.
Prosoco R-Guard FastFlash is a gun-grade waterproofing, adhesive and detailing compound that combines the best of silicone and polyurethane properties. This single-component, 99% solids, Silyl-Terminated-Poly-Ether (STPE) is easy to gun, spread and tool to produce a highly durable, seamless, elastomeric flashing membrane.
Use FastFlash as a liquid flashing membrane in rough openings of structural walls. Allows same day installation of windows, doors and other wall assembly, waterproofing or air barrier components. Use FastFlash to adhere, transition and counter-flash through-wall sheet flashing. Suitable for all climates, FastFlash bonds directly to damp or dry surfaces and cures under a variety of weather conditions. It simplifies the process of producing watertight details in new or existing construction.
Use FastFlash as part of a continuous, building-wide air barrier system, or to complement conventional waterproofing or air barrier components.
Appropriate for vertical or horizontal, above-grade applications to concrete, masonry, natural stone, structural sheathing, architectural metals, painted metals, glass, PVC, FRP, EPDM and most other building materials. Covers 15-20 square feet per sausage.
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Posted by Jacob Staub on 16th Jan 2014
After seeing Hammer and Hand use FastFlash for their Passive House projects I decided to I'd try it on my own project. The material itself is pretty amazing. Its mechanical properties are similar to automotive RTV silicone; high modulus of elasticity, thick, very sticky, difficult to remove once cured. The biggest difference between FastFlash and RTV silicone is vapor permeability. If applied to a damp substrate the material will transport moisture to the surface where it will actually bead.
For application, a Bondo-type spreader was found to be most effective. Since FastFlash is quite thick a fair amount of force is required to achieve desired application thickness. This is especially true when working around 35 fahrenheit which is the low temperature limit of the material. At the end of a day applying FastFlash the tendency is to ease up which winds up wasting a fair amount of very expensive material.
While FastFlash can be applied to damp substrates I found that it cannot be successfully applied to wet substrates. To me the difference between damp and wet is the ability to see a sheen of water on the substrate surface. If the surface is wet FastFlash appears to skin over before it has a chance to stick to the substrate. It won't stick to the substrate but it will stick to anything else that's not wet like your hands etc.
If it does stick and cure FastFlash is very difficult to remove. I tried a Stego Wrap / FastFlash detail I later had to take apart. Polyolefins are notoriously difficult to adhere to. FastFlash did not have a problem sticking polyolefin to itself. I ended up tearing the Stego Wrap before the bond between two pieces came apart.
Overall FastFlash is an amazing flashing material. If forced to build in a cold location or one that's particularly wet the low temperature limit of 35 degrees and skinning behavior when applied to wet substrates are drawbacks that will slow construction.